Biohydrogen production from lactate derived via co-fermentation of cassava starch wastewater and glycerol in a continuous multiple tube reactor.
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| Title: | Biohydrogen production from lactate derived via co-fermentation of cassava starch wastewater and glycerol in a continuous multiple tube reactor. |
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| Authors: | Baioco, Rafaela Adam1,2 (AUTHOR), Andreani, Cristiane Lurdes1,3 (AUTHOR), Orben, Jean Michel Chaves2 (AUTHOR), Rossi, Luana Cristina Calliari Leite1 (AUTHOR), Rodio, Eliandra1 (AUTHOR), Rafagnin, Karina1 (AUTHOR), Vaz, Victor1 (AUTHOR), Damasceno Gomes, Simone1 (AUTHOR) simone.gomes@unioeste.br |
| Source: | Environmental Technology. Jun2026, Vol. 47 Issue 14, p2236-2249. 14p. |
| Subject Terms: | *Hydrogen production, *Chemical oxygen demand, Lactic acid fermentation, Tubular reactors, Cassava starch, Lactates, Fermentation, Acetates |
| Abstract: | This study evaluated biohydrogen production in a continuous multiple tube reactor (CMTR) using a lactic acid-rich substrate derived from the co-fermentation of cassava starch wastewater (CSW) with glycerol. The process had two stages: (i) lactic acid (LA) production in an anaerobic sequential batch reactor (ASBR); and (ii) use of the LA-rich substrate in the CMTR at different organic loading rates (OLRs): 48, 72, and 96 g COD L⁻¹ d⁻¹, with a fixed hydraulic retention time of 4 h. The lactic fermentation produced a homogeneous substrate with 41% LA and 52% glycerol, suitable for hydrogen generation. CMTR performance varied with OLR: the highest OLR (96 g COD L⁻¹ d⁻¹) resulted in the greatest volumetric hydrogen production rate (1,960.3 mL H₂ L⁻¹ d⁻¹), biogas flow (9,360.9 mL d⁻¹), and COD removal (41.8%). The intermediate OLR (72 g COD L⁻¹ d⁻¹) achieved the highest hydrogen yield (8.4 mmol H₂ g⁻¹ COD), along with 95% lactic acid and 65% glycerol conversion. Metabolite profiling reinforced LA's role as a strategic substrate in promoting efficient fermentative routes, indicating a selective shift toward the butyric pathway, where lactic and acetic acids are converted into butyric acid and hydrogen. Overall, the results demonstrate that lactic pre-fermentation of CSW and glycerol produces a viable substrate for biohydrogen production, enabling the application of elevated OLRs and maintaining a pH favourable to hydrogenogenic microbial activity. The CMTR proved to be a promising system for agro-industrial waste valorisation through sustainable hydrogen generation. [ABSTRACT FROM AUTHOR] |
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| Database: | GreenFILE |
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